Velocity‐free fixed‐time attitude cooperative control for spacecraft formations under directed graphs

2021 ◽  
Author(s):  
Dayong Hu ◽  
Shijie Zhang ◽  
An‐Min Zou
Keyword(s):  
Cooperative Control ◽  
Directed Graphs ◽  
Fixed Time ◽  
Spacecraft Formations

scholarly journals Distributed fixed-time cooperative control of an islanded microgrid under event-triggered mechanism

2021 ◽  
Author(s):  
Deming Xu ◽  
Ze Li ◽  
Guozeng Cui ◽  
Wanjun Hao ◽  
Fuyuan Hu
Keyword(s):  
Cooperative Control ◽  
Fixed Time ◽  
Active Power ◽  
Settling Time ◽  
Power Sharing ◽  
Control Approach ◽  
Time Control ◽  
Islanded Microgrid ◽  
Control Protocols ◽  
Event Triggered

Abstract The secondary cooperative control problem of an islanded microgrid through event-triggered mechanism is investigated in this paper. A distributed fixedtime secondary cooperative control strategy is proposed to obtain frequency and voltage magnitude secondary restoration, and also a proportional active power sharing under an undirected topology. We consider a centralized event-triggered mechanism to alleviate the communication burden and reduce the frequency of controllers update. Through this mechanism, the distributed fixed-time control protocols using frequency, voltage magnitude and active power sampling measurement values of distributed generations (DGs) only when the predefined event-triggered condition is satisfied. Compared with the conventional distributed asymptotic control protocols under period-triggered communication, the secondary control objectives of an islanded microgrid are achieved within a fixed settling time by applying the presented distributed fixed-time control approach, and the upper bound of settling time is unrelated to any initial states. Meanwhile, the presented centralized event-triggered communication method exhibits excellent performance in alleviating communication burden and promoting control efficiency. The theoretical proof is given by adopting Lyapunov method. The simulation studies are conducted to illustrate the effectiveness of the proposed control scheme.

Distributed Fixed-Time Triggering-Based Containment Control for Networked Nonlinear Agents Under Directed Graphs

2020 ◽  
Vol 67 (10) ◽  
pp. 3541-3552
Author(s):  
Tao Xu ◽  
Guannan Lv ◽  
Zhisheng Duan ◽  
Zhiyong Sun ◽  
Junzhi Yu
Keyword(s):  
Directed Graphs ◽  
Fixed Time ◽  
Containment Control

Fixed-time consensus of first-order multi-agent systems over signed directed graphs

2021 ◽  
pp. 014233122110019
Author(s):  
Zhentao Li ◽  
Zhengxin Wang ◽  
Yuanzhen Feng
Keyword(s):  
Directed Graphs ◽  
Fixed Time ◽  
Control Parameters ◽  
Multi Agent Systems ◽  
Agent Systems ◽  
First Order ◽  
Strongly Connected ◽  
Multi Agent ◽  
Theoretical Results

This paper studies the fixed-time consensus problems of first-order multi-agent systems over signed directed graphs. Fixed-time consensus protocols are designed for first-order multi-agent systems without/with disturbances and first-order nonlinear multi-agent systems with disturbances, respectively. With proposed protocols, it is proved that multi-agent systems with strongly connected topologies will achieve consensus in a fixed time if the control parameters satisfy certain conditions. Finally, simulation examples are provided to verify the effectiveness of the theoretical results.

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